Research on Topology Construction and Switching Control Strategy of Wind Power Multi-terminal, Low-frequency Transmission System

Under the situation of global energy transformation and vigorous development of new energy, the proportion of offshore wind power in the amount of power generation from new energy resources has been increasing, and the research on offshore wind power related technologies has become increasingly important. For large-scale development of offshore wind power, on one hand, it is necessary to improve the grid connection reliability of the wind power itself. On the other hand, it is also necessary to develop new technical roads to improve the transmission efficiency, make full use of the transmission capacity of existing transmission lines or relieve the pressure on the construction of offshore transmission channels. Therefore, this paper will focus on offshore wind power, carrying out relevant research on offshore wind power and multi-terminal, low-frequency transmission technology based on modular multilevel matrix converter (M3C). This paper proposes feasible topologies and a switching control strategy for the multi-terminal, low-frequency transmission system, which achieve coordinated control among multiple M3Cs. A simulation model of the wind power multi-terminal, low-frequency transmission system is built on PSCAD/EMTDC simulation platform to verify correctness and effectiveness of the topology and the control strategy.